Free-range does not necessarily mean organic. Free-range refers to food from animals, for example meat or eggs, that are produced from animals that have access to outdoor spaces. Usually, free-range also stands for animals who have free access to graze or forage for food.
Free-range, unlike organic, is not a certification. Organically raised food is free-range, meaning animals must have access to pasture, but to be certified organic, food must meet stringent criteria. Free-range food doesn't have to meet any particularly stringent, or even legal requirements. For example, a farm claiming free-range falsely will not likely get into trouble, but a farm falsely claiming organic certification will get into trouble and have to deal with major fines.

